var code="" ; //在全局 定义验证码
	function createCode(){ 
	code = "";
	var codeLength = 6;//验证码的长度
	var checkCode = document.getElementById("checkCode");
	checkCode.value = "";
	var selectChar = new Array(0,1,2,3,4,5,6,7,8,9,'A','B','C','D','E','F','G','H','J','K','L','M','N','P','Q','R','S','T','U','V','W','X','Y','Z');

	for(var i=0;i<codeLength;i++) {
	   var charIndex = Math.floor(Math.random()*32);
	   code +=selectChar[charIndex];
	}
	if(code.length != codeLength){
	   createCode();
	}
	$("#checkCode").html(code);
	}

	function validate (){
		var name = $('#name').val();
		var pass = $('#pass').val();
		var inputCode = document.getElementById("checkNum").value.toUpperCase();
		if(name=='' ){
			alert("请输入昵称！");
			createCode();
			return false;
		}
		if(pass=='' ){
			alert("请输入昵称！");
			createCode();
			return false;
		}
		if(inputCode.length <=0) {
		   alert("请输入验证码！");
		   createCode();
		   return false;
		}
		if(inputCode != code ){
		   alert("验证码输入错误！");
		   createCode();
		   return false;
		}
		else {
		   return true;
		}
	}